Man - I wish I'd have read something like this when I first bought bitcoin. I don't think there's anything else out there in a printed form that covers all these fundamental concepts. It's very broad knowledge, while most Bitcoin content is quite specific. Each chapter could be a book in itself. I struggled initially with that high level approach but then realised it wasn't written for me. I know the effort & discipline it would have taken to condense this content. I'm reminded of the Mark Twain quote "I apologize for such a long letter - I didn't have time to write a short one."